5 speed Brommie Plus on T line help

Hello folks! I recently purchased a T Line Brompton and the following kit to try and get better gearing range without the need to go for the 12 speed.

Sadly I'm having no luck at all with the shifting especially down to the 13T and 11T

Does anyone have any experience of this and any suggestions?

https://youtu.be/3wWuR5FsvHQ

https://www.brommieplus.com/portal_c1_cnt_page.php?owner_num=c1_343119&button_num=c1&folder_id=73728&cnt_id=998224&search_field=&search_word=&search_field2=&search_word2=&search_field3=&search_word3=&bool1=&bool2=&search_type=1&up_page=1